Each year on the first Sunday after Pentecost we celebrate the Solemnity of the Most Holy Trinity, also known as Trinity Sunday. Although it wasn’t until 1334 that Pope John XXII officially established the feast for universal observance in the Western Church, the mystery of the Holy Trinity has been the pulse of the Church’s life since the very beginning. The Trinity is “the central mystery of Christian faith and life…[and is] the source of all the other mysteries of faith” (CCC 234). The whole of the Church’s life flows from the central belief that the one true God exists as three divine Persons—Father, Son, and Holy Spirit. Since the very beginning of time, God has gradually revealed and communicated the truth of who he is as Trinitarian through what he has done in salvation history (see CCC 53-67). Although God gradually revealed himself throughout different stages of the Old Testament period of salvation history, mankind had no way of knowing the full truth of God’s inner life of the Trinity before the time of Christ, since this mystery of our faith is “inaccessible to human reason alone…before the Incarnation of God’s Son and the sending of the Holy Spirit” (CCC 237).
Also – please go to Formed.org (as noted on the front page of our website – to watch: One God in Three Persons | Lectio: God | Episode 6
